CURLOPT_RANDOM_FILE − specify a source for random data
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RANDOM_FILE, char *path);
Pass a char * to a null-terminated file name. The file might be used to read from to seed the random engine for SSL and more.
The application does not have to keep the string around after setting this option.
NULL, not used
CURL *curl =
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_RANDOM_FILE, "junk.txt");
ret = curl_easy_perform(curl);
Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient heap space.